Hi David,
I can run a quick scan for you and tell you what sort of shape your link profile is in, but what 'could' have happened is that since the penalty, another algorithm has come along and hit you for something else. A little awkward to guess exactly though, but have seen this happen on a number of occasions.
Edit-- OK, your link profile isn't too healthy I'm afraid David. One even listed as Malicious... If you want to drop me a mail over, I will give you a little more info info@inetseo.co.uk
-Andy

